在 centos 下编译安装 php 时，有时候经常会忘了某些扩展，比如 pdo，mysqli，但是到扩展目录下，我们又找不到相应的扩展文件，（.so 文件），这样的情况下只能编译安装该模块，生成对应的 so 文件，然后在 php.ini 中添加相应的扩展记录，重启 php

安装mongo拓展：

就可以了，我们以安装 mysqli 为例。

首先进入 php 源码包如果找不到可以可下载一个地址在这里：

完成后，请编辑你php.ini文件增加一行
extension=mongo.so
一般默认的编译php的ini文件在
/usr/local/php/etc/php.ini
重启你的web服务器或者php-fpm，打印phpinfo，如果看到mongo项表，那么mongodb的扩展安装成功了

其他命令：

查看所有模块
[root@baseservice01 etc]# /usr/local/php/bin/php -m | grep -i mongo —mongo已安装成功
mongo
查看所有信息
[root@baseservice01 etc]# /usr/local/php/bin/php -i
[root@baseservice01 etc]# /usr/local/php/bin/php -i|grep -i conf
Configure Command => ‘./configure’ ‘–prefix=/usr/local/php’ ‘–enable-fpm’ ‘–with-fpm-user=www’ ‘–with-fpm-group=www’ ‘–with-mysql=mysqlnd’ ‘–with-mysqli=mysqlnd’ ‘–with-pdo-mysql=mysqlnd’ ‘–with-iconv-dir’ ‘–with-freetype-dir’ ‘–with-jpeg-dir’ ‘–with-png-dir’ ‘–with-zlib’ ‘–with-libxml-dir=/usr’ ‘–enable-xml’ ‘–disable-rpath’ ‘–enable-magic-quotes’ ‘–enable-safe-mode’ ‘–enable-bcmath’ ‘–enable-shmop’ ‘–enable-sysvsem’ ‘–enable-inline-optimization’ ‘–with-curl’ ‘–with-curlwrappers’ ‘–enable-mbregex’ ‘–enable-mbstring’ ‘–with-mcrypt’ ‘–enable-ftp’ ‘–with-gd’ ‘–enable-gd-native-ttf’ ‘–with-openssl=/usr/local/openssl’ ‘–with-mhash’ ‘–enable-pcntl’ ‘–enable-sockets’ ‘–with-xmlrpc’ ‘–enable-zip’ ‘–enable-soap’ ‘–without-pear’ ‘–with-gettext’ ‘–enable-fileinfo’
Configuration File (php.ini) Path => /usr/local/php/lib –配置文件路径
Loaded Configuration File => /usr/local/php/lib/php.ini –使用的配置文件
Configuration
Openssl default config => /usr/local/openssl/ssl/openssl.cnf

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PHP 扩展-mysqli.so